Fenton's reagent is a chemical solution used primarily in environmental chemistry for the degradation of organic pollutants. It consists of a mixture of hydrogen peroxide (H₂O₂) and iron(II) sulfate (FeSO₄). The iron ions catalyze the decomposition of hydrogen peroxide, producing hydroxyl radicals, which are highly reactive and can break down various organic compounds. This reagent is particularly effective in treating contaminated water and soil, as it can oxidize a wide range of pollutants, including phenols and pesticides. Fenton's reagent is valued for its ability to enhance the efficiency of advanced oxidation processes in environmental remediation efforts.